One vertex per element, one color per generator, with an edge from x to x·s.
(3,7)(6,8)(9,10,14,11)(12,17,19,15)(13,18,21,16)(20,22,24,23)(25,26,30,28)(27,33,34,31)(29,36,37,32)(35,38,40,39)(41,42,45,48)(43,49,51,46)(44,47,52,54)(50,55,56,53)(2,5)(6,8)(12,19)(15,17)(20,24)(22,23)(26,28)(27,34)(29,37)(38,39)(41,42,45,48)(43,46,51,49)(44,47,52,54)(50,53,56,55)(1,2)(3,6)(4,5)(7,8)(9,11,14,10)(12,17,19,15)(13,18,21,16)(20,23,24,22)(25,27,30,34)(26,31,28,33)(29,35,37,40)(32,38,36,39)(41,42)(43,49)(44,47)(45,48)(46,51)(50,55)(52,54)(53,56)(9,12)(10,15)(11,17)(13,20)(14,19)(16,22)(18,23)(21,24)(25,28,30,26)(27,33,34,31)(29,36,37,32)(35,39,40,38)(41,43,45,51)(42,46,48,49)(44,50,52,56)(47,53,54,55)(1,3)(2,6)(4,7)(5,8)(9,13)(10,16)(11,18)(12,20)(14,21)(15,22)(17,23)(19,24)(25,29)(26,32)(27,35)(28,36)(30,37)(31,38)(33,39)(34,40)(41,44,45,52)(42,47,48,54)(43,50,51,56)(46,53,49,55)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.